Ernst hammesfahr



(No Model.) 7 v E. HAMMESPAI-IR. DROP HAMMER.

No. 409,836. Patented Aug. 27, 1889.

N, PEI'ERS. Phola-Liihognplwr, Wash inglnn. u c.

UNITED STATES PATENT OFFICE.

ERNST HAMMESFAHR, OF SOLINGEN, PRUSSIA, GERMANY.

DROP-HAMMER.

SPECIFICATION forming part of Letters Patent No. 409,836, dated August 27, 1889. Application filed May 14, 1889. Serial No. 310,743. (No model.) Patented in Germany May 13, 1887 No. 43,744.

To all whom it may concern:

Be it known that I, ERNST HAMMESFAHR, a subject of the Emperor of Germany, residing at Solin gen, in the country of the Rhine, Prussia, Germany, have invented a certain Improvement relatin to llamm ers, of which the following is a specification.

It is the subject of a German patent, No. 43,744, dated May 13, 1887,

The hammer may be of any weight and allowed to drop any distance. I will describe it as a heavy hammer guided in vertical ways and lifted through the medium of a flexible strap. I lift the hammer and liberate it, and allow it to fall so as to make two blows for each revolution of a constantly-revolving shaft. The shaft carries a wheel, across which is a slot, in which a block can slide, and the block carries a pin, which carries an eye, at tached to the hammer by means of the strap. During a portion of each revolution the block lies in one end of the slot and works like a cranlepin, lifting the hammer in the same manner as if it were a permanent crank. But when the revolving motion carries it about two-thirds of the way to the highest point the block commences to slide across and shift its position to the other end of the slot. It slides free across, allowing the hammer to drop. The revolution of the shaft and its attachments continn es during the period while the block is thus sliding across, and immediately after the hammer has struck its heavy blow on the hot iron or other object being treated the continued revolution again commences to lift the block. Consequently the hammer and the operation is repeated, the hammer being lifted first by one end of the slot and then by the other end, so that it is lifted and allowed to fall twice for each revolution of the shaft. I provide the slot with adjustable side pieces, by which the fit on the sliding block may be tightened and relaxed at will, so as to'modify the action within Wide limits.

The accompanying drawings form a part of this specification, and represent what I consider the best means of carrying out the invention.

Figure l is a central vertical section partly in e1evation. Fig. 2 is an elevation at right angles to the view in Fig. 1. Fig. 3 is 011 a smaller scale and represents a modification. It is a front view, corresponding to Fig. 2.

The drawings show the novel parts, with so much of the ordinary parts as is necessary to indicate their relation thereto. I

Similar letters of reference indicate corresponding parts in all the figures where they 7 friction-clutch or other clutch not shown.

D is a wheel of sufficient size fixed on the overhung end of the shaft B. A slot 61 me tends across thiswheel. The sides of this slot are equipped with ledges It, which are held by stout screw-bolts G, extending in the direction parallel to the shaft B. The ledges are pressed together by screws H.

M is a stout block or carriage fitted in the slot (1, and which is allowed to slide therein, as will presently appear. It carries a stout pin m, on which is fitted one or more collars and a nut N, which serve to retain an easilyfitting eye P, to which the hammer W is attached by a strap Q. Supposing the wheel D to be slowly revolved, the block M, lying in one end of the slot (Z, the end which is lowest, is carried by the revolving motion gradually upward to the level of the center of the shaft and a little higher; then it yields to the force impressed by its own gravity and that of the heavy hammer NV, acting through the strap Q, and slides across through the slot cl to the other side of the wheel, allowing the strap Q to be thereby slaeked and hammer IV to drop. YVhile the block M and its attachments are moving across, the continuedrevolution of the wheel D brings the slot cl into a more and more vertical position, so that by the time the block is quite across and the hammer has struck the anvil X or whatever is being treated thereon the wheel is in position to again commence to lift the block M and its attachments, which it does. The shaft B ICC should be revolved at such rate as to promptly lift the hammer after each blow, especially in hammering thin hot metal.

The adjustable ledges E afford facilities for modifying the action. When adjusted to simply guide the block M, the latter is free to commence to slide across so soon as it has been lifted to any extent above the center of the wheel, but if it is set by the screws, so as to nip the block M with force at and near the ends of the slot, it may still move freely across the middle part of the wheel, so as to strike with the full force of the hammer, but will be obstructed in its starting, so that it will not start until it has been lifted higher. Under such adjustment the hammer will strike harder blows. If there are means not shown for varying the time of revolution of mechanic Without departing from the princi-.

ple or sacrificing the advantages of the invention.

Fig. 3 shows the invention carried out by operating the shaftB at a low point alongside of the hammer, the latter being lifted by leadingthe strap over a pulley. In such case the eye P on the end of the strap Q is pulled down, instead of up, to raise the hammer, but the action is the same.

Parts of the invention can be used without the whole. I can dispense with the means for adjusting the ledges at the sides of the slot (1 and can Work the hammers uniformly, varied only by the rate of speed of the revolution of the shaft, or varied not at all. For some work there is little need of varying the action. V

I term the revolving part D, carrying the slot 01 a wheel, but it is evidently not es sential that it be round.

I term the transverse track or guideway (Z a slot, but it is not necessary that it be sunk completely through the whole thickness'of the wheel. The functions of compelling the block or equivalent carriage M to travel with it in lifting the hammer and guiding the block across as it slides are alone important for this feature.

I claim as my invention 1. The revolving wheel D, having a slot or guideway 61 across its outer face, in combination with theblock M and connection therefrom to a hammer WV, as herein specified.

2. The wheel Dand means for revolving it, carrying adjustable ledges E and means H for setting the latter at will, in combination with each other and with the block. or carriage M, eye P, connection Q, and hammer WV, 

